There is also this very useful article on rank transformations:
Conover, W., & Iman, R. (1981). Rank transformations as a bridge between
parametric and nonparametric statistics. 1981:129: 1254-129. American
Statistician, 129, 1254-1290.
Dan
Dan Chandler
436 Old Wagon Road
Trinidad, CA 95570
Phone and fax: 707 677 0895
E-mail: [email protected]
*************************************************
Scheirer CJ, Ray WS, Hare N (1976) The analysis of ranked data derived
from completely randomized factorial designs. Biometrics 32:429-434
Groggel DJ, Skillings JH (1986) Distribution-free tests for main effects
in multifactor designs. American Statistician 40:99-102
Cheers,
- -Dave
***************************************************
*
* For searches and help try:
* http://www.stata.com/support/faqs/res/findit.html
* http://www.stata.com/support/statalist/faq
* http://www.ats.ucla.edu/stat/stata/